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PAN3201DH Datasheet(PDF) 15 Page - Pixart Imaging Inc.

Part No. PAN3201DH
Description  LOW POWER CMOS OPTICAL MOUSE SENSOR
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Maker  PIXART [Pixart Imaging Inc.]
Homepage  http://www.pixart.com.tw
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PAN3201DH Datasheet(HTML) 15 Page - Pixart Imaging Inc.

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PixArt Imaging Inc.
PAN3201DH
CMOS Optical Mouse Sensor
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission
.
15
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
V1.0, Mar. 2006
6.1.2 Read Operation
A read operation, which means that data is going from the PAN3201DH to the micro-controller, is always
initiated by the micro-controller and consists of two bytes. The first byte contains the address, is written by the
micro-controller, and has a “0” as its MSB to indicate data direction. The second byte contains the data and is
driven by the PAN3201DH. The transfer is synchronized by SCLK. SDIO is changed on falling edges of SCLK
and read on every rising edge of SCLK. The micro-controller must go to a high Z state after the last address data
bit. The PAN3201DH will go to the high Z state after the last data bit.
SDIO driven by Micro-controller
SDIO driven by sensor
Note "A"
Note "B"
7
8
A0
D7
1. Micro-controller send address to sensor
2. Micro-controller release and set SDIO to Hi-Z after the last address bit.
9
16
D0
1. Sensor send data to Micro-controller .
2. Sensor release and set SDIO to Hi-Z after the last data bit.
Hi-Z
Hi-Z
1
SCLK
SDIO
SDIO
SCLK
A1
SCLK
SDIO
12
34
56
78
10
A5
A4
A3
A2
A1 A0
D7
D6
D5
D4
D3
D2
D1
D0
9
11
12131415
A6
0
DON'T
CARE
16
R/W bit of next address
SDIO driven by micro-controller
R/W bit of next
address
tHOLD
3us,min
Figure11. Read Operation
6.2 Re-Synchronous Serial Interface
There are times when the SDIO line from the PAN3201DH should be in the Hi-Z state. If the microprocessor
has completed a write to the PAN3201DH, the SDIO line is Hi-Z, since the SDIO pin is still configured as an
input. However, if the last operation from the microprocessor was a read, the PAN3201DH will hold the D0
state on SDIO until a rising edge of SCLK. To place the SDIO pin into the Hi-Z state, first raise the PD line, and
then toggle the SCLK line from high to low to high. The SDIO line will now be in the Hi-Z state. The
PAN3201DH and the micro-controller might get out of synchronization due to following condition.
PD
SDIO
SCLK
Hi-Z
1us,min
12 34 56 789
1
0
1
1
1
2
1
3
1
4
1
5
1
6
ADDRESS(R/W)
DATA
Figure12. Forcing PAN3201DH SDIO line to the Hi-Z stat


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